/* Copyright 2012 The Netty Project
 * 
 * The Netty Project licenses this file to you under the Apache License, version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at:
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License. */
package io.netty.example.telnet;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import java.net.InetAddress;
import java.util.Date;

/**
 * Handles a server-side channel.
 */
@Sharable
public class TelnetServerHandler extends SimpleChannelInboundHandler<String> {

	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		// Send greeting for a new connection.
		ctx.write("Welcome to " + InetAddress.getLocalHost().getHostName() + "!\r\n");
		ctx.write("It is " + new Date() + " now.\r\n");
		ctx.flush();
	}

	@Override
	public void channelRead0(ChannelHandlerContext ctx, String request) throws Exception {
		// Generate and write a response.
		String response;
		boolean close = false;
		if (request.isEmpty()) {
			response = "Please type something.\r\n";
		} else if ("bye".equals(request.toLowerCase())) {
			response = "Have a good day!\r\n";
			close = true;
		} else {
			response = "Did you say '" + request + "'?\r\n";
		}

		// We do not need to write a ChannelBuffer here.
		// We know the encoder inserted at TelnetPipelineFactory will do the conversion.
		ChannelFuture future = ctx.write(response);

		// Close the connection after sending 'Have a good day!'
		// if the client has sent 'bye'.
		if (close) {
			future.addListener(ChannelFutureListener.CLOSE);
		}
	}

	@Override
	public void channelReadComplete(ChannelHandlerContext ctx) {
		ctx.flush();
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
		cause.printStackTrace();
		ctx.close();
	}
}
